The invention provides protection of the heat sensitive piezo ultrasonic transducer by controlling the environmental temperature in which the transducer operates. As temperature rises in the cooling chamber coolant may be circulated in order to draw off excessive heat. This allows non-destructive testing...http://www.google.com.au/patents/US5936163?utm_source=gb-gplus-sharePatent US5936163 - Portable high temperature ultrasonic testing (UT) piezo probe with cooling apparatus
